Apr 21, 2010 8:47 AM EST

Reds pitcher Edinson Volquez is blaming his 50-game suspension for violating baseball's anti-drug policy on a fertility drug.

He insists that taking the drug was an innocent mistake.

"I don't think it would be something inadvertent," Gary Wadler, a board member of the World Anti-Doping Agency, said. "It's not a very effective drug for fertility. Testicles shrivel with steroid use, and this is used to get testicles back to normal. If it was (to have children), he would have requested a TUE (therapeutic use exemption)."

MLB is not permitted to publicly release which drug caused the positive test.

Via USA Today